global class SchedulableInstagramComments implements Schedulable{
       global SchedulableInstagramComments (){}

        public static void startComments(){
            //Seconds Minutes Hours Day_of_month Month Day_of_week optional_year
            System.schedule('Instagram Latest Comments', '0 30 * * * ?', New SchedulableInstagramComments());
        }   
    
    
        global void execute(SchedulableContext ctx) {
           batchInstagramComments b = new batchInstagramComments();
           Database.executeBatch(b,1);
                
        }
    }